| **Income Taxes (Details) € in Millions, $ in Millions**                                          | 3 Months Ended | 9 Months Ended |         |        |
|--------------------------------------------------------------------------------------------------------|----------------|----------------|---------|--------|
||
| **Income Tax Examination [Line Items]**                                                                |           |           |    |   |   |   |
| Unrecognized tax benefits                                                                              | $ 250          |           | $ 250   |   |   | $ 338 |
| Accrued interest and penalties                                                                         | $ 38           |           | $ 38    |   |   | $ 58 |
| Effective income tax rate reconciliation, percent                                                      | 13.50%         | 17.60%         | 16.30%  | 12.70% |   |   |
| Special charges, acquisition-related costs, and discrete tax items impact of effective income tax rate | (0.10%)        | (1.60%)        | (3.10%) | 4.20%  |   |   |
| Liability for uncertain tax positions                                                                  | $ 48           |           | $ 48    |   | € 43 |   |
| IRS                                                                                                    |           |           |    |   |   |   |
| **Income Tax Examination [Line Items]**                                                                |           |           |    |   |   |   |
| Reduction of uncertain tax positions from settlements                                                  | 157            |           |    |   |   |   |
| Reduction of accrued interest from settlements                                                         | $ 25           |           | $ 25    |   |   |   |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Effective Income Tax Rate Reconciliation, Special Charges, Acquisition Costs, Contingent Consideration Liabilities and Discrete Tax, Percent
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount the liability recorded for the income tax examination increased or decreased in the current year/accounting period.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                     |
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| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount recognized for uncertainty in income taxes classified as current.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of unrecognized tax benefits.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.
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